Pull-up exercise apparatus



FIG. 1 is a front elevational view of the pull-up exercise apparatus showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a perspective illustration of my new design. 

The ornamental design for a pull-up exercise apparatus, as shown and described. 